The Marini study demonstrates that electronic cigarettes do lead to a reduction in exhaled nitric oxide, which suggests that they have a mild respiratory irritant effect and induce some inflammation in the airways. This is a finding which has been reported previously in a number of studies. It is not surprising because propylene glycol is known to be a mild respiratory irritant.

There is absolutely no evidence that youth who try e-cigarettes will progress to cigarette smoking and face the deadly diseases associated with tobacco cigarettes. But if you just make up this evidence, then of course it makes sense to argue against electronic cigarettes. Anyone can make a persuasive argument if they are allowed to just make up the supporting evidence.

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